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Table 2 Adjusted prevalence of CB according to gender and age

From: Diverging trends of chronic bronchitis and smoking habits between 1998 and 2010

  

Adjusted prevalence (%) [95% CI]

 
  

ISAYA (1998/2000)

GEIRD (2007/2010)

p-value‡

Gender*

Males

12.3 [12.0−12.6]

12.6 [11.8−13.4]

0.575

 

Females

12.6 [11.9−13.3]

12.7 [11.3−14.3]

0.920

Age†

<30 years

11.8 [11.2−12.5]

12.2 [10.9−13.6]

0.577

 

≥30 years

12.7 [12.2−13.2]

12.9 [12.0−13.8]

0.692

TOTAL

 

12.5 [12.1−12.9]

12.6 [11.7−13.7]

0.781

  1. * prevalence obtained by stratifying on gender and adjusted for age, season of response, type of contact, cumulative response rate, and centre.
  2. † prevalence obtained by stratifying on age and adjusted for gender, season of response, type of contact, cumulative response rate, and centre.
  3. prevalence adjusted for gender, age, season of response, type of contact, cumulative response rate, and centre.
  4. ‡ p-value obtained by testing the null hypothesis that the regression coefficient of the dummy indicator of the study (GEIRD vs ISAYA) was zero.
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Respiratory Research

ISSN: 1465-993X

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